Which of the Statements Is True of the Fossil Record

Multiple Choice

Which of the statements is true of the fossil record?

A) All of the stratified layers will be found anywhere a core sample is taken,except for human destruction.
B) Provided there is no uplifting,tilt,etc. ,the deeper the layer,the more recently it was laid down.
C) Once fossils are formed in a sedimentary layer,they are then protected from temperature and heat.
D) Fossil assemblages are important in identifying sedimentary layers and different layers have different assemblages of fossils.